Method of severing drawn-glass cylinders.



No. 805,943. PATEN'TED NOV. 28, 1905 J. CAMPBELL. METHOD OF SBVERINGDRAWN GLASS CYLINDERS.

APPLICATION FILED AUG. 1. 1903.

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JAMES CAMPBELL, OF PITTSBURG PENNSYLVANIA, ASSIGNOR TO JAMES A.CHAMBERS, TRUSTEE, OF PITTSBURG, PENNSYLVANIA.

METHOD OF SEVERING DRAWN-GLASS CYLINDERS.

' Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed August 1, 1903. Serial No. 167,851.

from a body of molten glass it is important that at the end of thedrawing operation the cylinder be separated from the molt-en body in amanner which involves no injury to the cylinder and as little waste ofthe glass as possible: My invention is designed to accomplish thesedesirable purposes; and it consists in severing the cylinder from thebody of molten glass by making a perforation in the cylinder near itsbase and using this perforation as a starting-point to shear around thecircumference of the cylinder until it is severed.

In Fig. 1 of the drawings, 2 represents the glass cylinder which isdrawn from a body of molten glass 3, contained in a suitable receptacle4;, the drawing-tool being indicated at 5, the hood 6 being a devicewhich is sometimes applied to retard the cooling of the glass near itsconnection with the drawingtool. When it is desired to sever the drawncylinder from the body of glass 2, I insert through its walls a pair ofclosed shears 7 the outeredges of whose points are sharp, so as toperforate the glass readily. By opening these shears somewhat theperforation in the cylinder is enlarged, and then by withdrawing theshears and using them in the manner in which shears are ordinarily usedin cutting, as shown in Fig. 2, the operator cuts the somewhat plasticcylinder around its circumference until it is entirely severed from theportion of glass be- .low. By proceeding in this way the body of thecylinder is not injured and there is very little waste of material.

The initial perforation of the glass may be formed otherwise than by theuse of shears, since What I claim is 1. The method of separatingdrawn-glass cylinders from the body of glass from which they are drawn,which consists in perforating the wall of the cylinder near its base andthen shearing the cylinder around its circumference; substantially asdescribed. 7

2. The method of separating drawn-glass cylinders from the body of glassfrom which they are drawn, which consists in perforating the wall of thecylinder near its base, enlarg ing the opening thus formed and thenshearing the cylinder around its circumference; substantially asdescribed.

In testimony whereof I have hereunto set my hand.

JAMES CAMPBELL.

Witnesses: I

Gno. B. BLEMING, L. M. REDMAN.

